Transmitter for wireless telephony



1923 s. o. E. T. TROST TRANSMITTER FOR WIRELESS TELEPHONY Filed June 21 1921 gvweutoz S.O.E.T. TROST.

@Q WW Patentedsept. '18, 192 3.

I a UNHTED 1 CORPORATION or Manama, a'conroaarron-or D LAWARE."

" f TRANSMITTER 'aeawmams ammany.

Application filed Julie a1," eer."seriai f ni-iragvsf (GRANTED nmmn THEraovrsmnstr runner OE Mli R GH S;1921,,4i-STA1. n, 1313.)

To all whom z't may 00mm.-

Be it known that I, SoREN OLUF 'EMIL THERKELSEN Tnos'r, a Danish-subject, off Marconi House, Strand, London, W'. 0., England, have made certain new and useful Improvements in Transmitters for Wireless Telephony (for which I have filed an application in Great Britain Augustlfi, 1919, Patent 11,831 of1915) of whichthe following is;

a specification.

The object of this invention is to provide an improved transmitter for wireless teleph-' ony.

neutralize each other, and We control the phase of one set by a'microphone or the like. When the microphone is in action it alters each other and oscillations corresponding to those of the michrophone are consequently I emitted. Preferably the oscillations'are controlled by a circuit of small power which in "its turn is controlled by the microphone.

Preferably also ,we employ semi-continuous oscillations produced as described in U. S. Patent 1,271,190. V f

In the accompanying diagram we illustrate our invention as applied to such a transmitter.

4 C C are condensers continuously 0011 nected to a source of current B and d1scharged in succession by 1 a disk discharger D through quenching devices Q Q and] primaries P 1 of a secondary S in the aerial circuit. The time of the discharge is controlled by the discharges of auxiliary condensers K K effected by a second disk discharger T D, as described in the specification already referred to; i M is a microphone inserted in the discharging circuit of the condenser K or the microphone may bc placed in the charging circuit of one of the condensers K K t According to this invention we provide means for setting up in an aerial two or more sets of oscillations, the phases thereof being such that'the oscillations normally claimcisz' f p 1. In a transmitter I-Iavingi described inventiomi V high frequency signals," the combination ofmeansfor pro= 4 soREN OLIUF EMILTHERKELSEN rnosr; or mass ge -T rms, ssumesTo mime ff f Vducing two or w, more, sets of oscillations "j 1 which normally neutralize 'eaclr'other and j 7' means adapted to vary the relative phase of w the oscillations for the production of signals.

- 2. In a transmitter for high '-.'frequency f signals'the combination of means for pro ducing twoor moreTs'ets" of oscillations which normallyneutralize each other, low" power I circuits adapted to vary the relative phase poweriand means adapted to control'the low circuits for thegproductionof signals.

I 3. In-a transmitter for wireless telephone,

the-combination of means for'p'roducing in adapted to control the phase of the oscilla- 'tions'of one set, substantially as describedJ at, In a transmitte'r for wireless telephone,

which normally are of opposite phase-and an aerial 'two' or more sets of-oscillations 5 1 which normally are ofopposi t e phase and; neutralize each other, and; a ,microphone the phase of one or more of the sets of oscil-i 5 lations, so that they 'no longer neutralize '70 the combination of. means for producing in, an aerial twoV-or'more sets of oscillations power circuits, substantially as described.

- 5. In a transmitter for wireless telephony the combination of means for producing in o an aerial twoor more sets-of oscillations which normally are :of' opposite phase and neutralize each other and a microphone adapted to dephase the oscillations whereby currents are induced in the aerial.

.6. In a transmitter for wireless telephony the combination of means for producing in an aerial two or more sets of oscillations whichqnormally are of opposite phase and neutralize I each j other, low power-circuits adapted to control the phases and a micropower c'rcuits whereby currents. are induced in the aerial.

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